Gas turbine combustor and gas turbine

A gas turbine combustor that receives compressed air discharged from a compressor, mixes the compressed air with a fuel, burns a mixture of the compressed air and the fuel to generate a combustion gas, and supplies the generated combustion gas to a turbine, the gas turbine combustor comprising:

• an inner cylinder configured to form a combustion chamber therein;
• an outer cylinder configured to cover the inner cylinder and form a cylindrical outer circumferential flow path between the outer cylinder and the inner cylinder to allow the compressed air to flow;
• and
• a burner that is mounted on an end of the outer cylinder, the end being positioned on an opposite side to a side where the turbine is located, and that faces the combustion chamber, wherein
• the burner includes a plurality of fuel nozzles configured to inject the fuel, and a cavity configured to distribute the fuel to the fuel nozzles,
• the cavity is demarcated by a groove formed in a structural material of the burner to create a level difference at an opening, and a cover fitted into the level difference to close the groove,
• the cover is formed by a web and a flange and joined by welding to the structural material in such a manner as to have an L-shaped or U-shaped cross-section, the web facing a bottom surface of the groove and covering the opening in the groove, the flange extending in a depth direction of the groove from an edge of the web and fitted into the level difference,
• when viewed in a cross-section orthogonal to the groove, a cover-side inner surface that is an inner surface of the flange is flush with a groove-side inner surface that is an inner surface of the groove, the cover-side inner surface and the groove-side inner surface together forming a lateral surface of the cavity, and
• a boundary between the cover-side inner surface and the groove-side inner surface is spaced away from a first corner of the cavity that is sandwiched between the cover-side inner surface and an inner surface of the web, the inner surface of the web forming a ceiling surface of the cavity.